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Time to Stabilization: Number of Practice Trials and Measured Trials Needed

VanMeter, Ashley D
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1178291778

Abstract Details

2007, Master of Science in Exercise Science, University of Toledo, Exercise Science.
Objective: To establish a standard protocol for the number of practice and test trials needed for testing TTS. Design and Setting: Separate trial (1-20) by side dominant,non-dominant) repeated measures ANOVA was performed for APTTS and MLTTS. A paired samples t-test was performed to determine the number of failed trials between the dominant and non-dominant sides. A Scheffe’s post-hoc test was applied. Significance was set at p<0.05. Subjects: Thirty-one healthy subjects participated in this study. Measurements: Subjects participated in one testing session. Twenty trials of a jumplanding task were performed on each leg. The jump-landing task consisted of a single leg landing from a double leg jump height equivalent to 50% of the subject’s maximum jump height. Subjects started 70cm away from the center of the forceplate (Bertec, Corp; Columbus, OH). Subjects jumped off of both feet, reached up and touched the indicated marker, and landed on the forceplate with one foot. The landing leg was randomized. Results: For MLTTS, no significant interaction between side and time existed (F19,570=.078, p =.667; power = 0.64). A significant main effect for trial existed (F19, 570= 2.901, p< .001; power = 0.99). There was no significant main effect for Side dominant (1.61± .03)non-dominant(1.63 ± .03)(F1, 30= 6.17, p = .438; power = 0.12). For APTTS, there was no significant interaction between Side and Time. (F19, 570= .973, p = .492; power = 0.73) There was no significant main effect for trial (F19, 570= 1.34, p = .153; power = 0.89) or side (dominate (1.18 ± .02) vs. non-dominate (1.19 ± .02)) (F1, 30= .081, p = .778; power = 0.06). For failed trials, there was no significant difference between the dominant (5.90±0.84 trials) and non-dominant (6.00±1.06 trials) (t=-0.97, p = .924). Conclusion: This study attempted to determine how many practice and test trials are needed to achieve consistency. It appears that either leg can be used during TTS calculations which will help clinicians trying to find a base comparison for the injury leg. However, the primary purpose of this study, which was to determine the number of trials needed to overcome a learning effect, was not realized fully. We can cautiously conclude that three practice trials would allow a healthy subject to become familiar with the task. However, this study brings up the question if there really is a learning effect that is quantifiable associated with TTS assessment in healthy subjects.
Phillip Gribble (Advisor)
55 p.
Time to Stabilization; Dynamic Postural Control

Recommended Citations

Citations

  • VanMeter, A. D. (2007). Time to Stabilization: Number of Practice Trials and Measured Trials Needed [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1178291778

    APA Style (7th edition)

  • VanMeter, Ashley. Time to Stabilization: Number of Practice Trials and Measured Trials Needed. 2007. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1178291778.

    MLA Style (8th edition)

  • VanMeter, Ashley. "Time to Stabilization: Number of Practice Trials and Measured Trials Needed." Master's thesis, University of Toledo, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1178291778

    Chicago Manual of Style (17th edition)

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© 2007, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.